
// Based on `Timestamp picker` (http://us.geocities.com/tspicker/)
//Show calendar windows:
// Params: str_target -  full name of form element (e.g. 'document.form1.date_element')
//	    str_date - default value of the date
var app_name = 'sport';
function show_calendar(str_target, str_date)
{
	var arr_months = ["January", "February", "March", "April", "May", "June",
		"July", "August", "September", "October", "November", "December"];
	var week_days = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"];
	var n_weekstart = 1; // day week starts from (normally 0 or 1)

	var dt_datetime = (str_date == null || str_date =="" ?  new Date() : str2dt(str_date));
	var dt_prev_month = new Date(dt_datetime);
	dt_prev_month.setMonth(dt_datetime.getMonth()-1);
	var dt_next_month = new Date(dt_datetime);
	dt_next_month.setMonth(dt_datetime.getMonth()+1);
	var dt_firstday = new Date(dt_datetime);
	dt_firstday.setDate(1);
	dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
	var dt_lastday = new Date(dt_next_month);
	dt_lastday.setDate(0);

        var dt_prev_year =  new Date(dt_datetime);
	dt_prev_year.setYear(dt_datetime.getFullYear()-1);
        var dt_next_year =  new Date(dt_datetime);
	dt_next_year.setYear(dt_datetime.getFullYear()+1);

        var year_select_str = "<select name=\"year\" style=\"background-color:#87CEFA;height:18px;font-size:12px;\""+
        			" onchange=\"dt_new = new Date('"+dt_datetime+"'); dt_new.setYear(this.value);window.opener.show_calendar('"+str_target+"',window.opener.dt2dtstr(dt_new));\">\n";
        for(yy=(new Date()).getFullYear()+5;yy>=1940;yy--)
        {
          year_select_str+="<option value=\""+yy+"\"";
          if(yy==dt_datetime.getFullYear())
           year_select_str+= " selected";
          year_select_str+=">"+yy+"</option>\n"; //" "+dt_datetime.getFullYear()
        }
        year_select_str+="</select>";

        var month_select_str = "<select name=\"month\" style=\"background-color:#87CEFA;height:18px;font-size:12px;\""+
        			" onchange=\"dt_new = new Date('"+dt_datetime+"'); dt_new.setMonth(this.value);window.opener.show_calendar('"+str_target+"',window.opener.dt2dtstr(dt_new));\">\n";
        for(mm=0;mm<12;mm++)
        {
          month_select_str+="<option value=\""+mm+"\"";
          if(mm==dt_datetime.getMonth())
           month_select_str+= " selected";
          month_select_str+=">"+arr_months[mm]+"</option>\n"; //" "+dt_datetime.getFullYear()
        }
        month_select_str+="</select>";

	// html generation (feel free to tune it for your particular application)
	// print calendar header
	var str_buffer = new String (
		"<html>\n"+
		"<head>\n"+
		"	<title>Calendar</title>\n"+
		"</head>\n"+
		"<body bgcolor=\"White\">\n"+
		"<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
		"<tr><td bgcolor=\"#4682B4\">\n"+
		"<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
		"<tr>\n	<td bgcolor=\"#4682B4\"><a href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
		"<img src=\"/sport/images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"previous month\"></a></td>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"5\" align=\"center\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+month_select_str+"</font></td>\n"+
		"	<td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_month)+"');\">"+
		"<img src=\"/sport/images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"next month\"></a></td>\n</tr>\n"+

		"<tr>\n	<td bgcolor=\"#4682B4\"><a href=\"javascript:window.opener.show_calendar('"+
		str_target+"', '"+ dt2dtstr(dt_prev_year)+"');\">"+
		"<img src=\"/sport/images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"previous month\"></a></td>\n"+
		"	<td bgcolor=\"#4682B4\" colspan=\"5\" align=\"center\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
		+year_select_str+"</font></td>\n"+
		"	<td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:window.opener.show_calendar('"
		+str_target+"', '"+dt2dtstr(dt_next_year)+"');\">"+
		"<img src=\"/sport/images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
		" alt=\"next month\"></a></td>\n</tr>\n"

	);

	var dt_current_day = new Date(dt_firstday);
	// print weekdays titles
	str_buffer += "<tr>\n";
	for (var n=0; n<7; n++)
		str_buffer += "	<td bgcolor=\"#87CEFA\">"+
		"<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+
		week_days[(n_weekstart+n)%7]+"</font></td>\n";
	// print calendar table
	str_buffer += "</tr>\n";
	while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
		dt_current_day.getMonth() == dt_firstday.getMonth()) {
		// print row heder
		str_buffer += "<tr>\n";
		for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
				if (dt_current_day.getDate() == dt_datetime.getDate() &&
					dt_current_day.getMonth() == dt_datetime.getMonth())
					// print current date
					str_buffer += "	<td bgcolor=\"#FFB6C1\" align=\"right\">";
				else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
					// weekend days
					str_buffer += "	<td bgcolor=\"#DBEAF5\" align=\"right\">";
				else
					// print working days of current month
					str_buffer += "	<td bgcolor=\"white\" align=\"right\">";

				if (dt_current_day.getMonth() == dt_datetime.getMonth())
					// print days of current month
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					"('"+dt2dtstr(dt_current_day)+"'); window.close();\">"+
					"<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
				else
					// print days of other months
					str_buffer += "<a href=\"javascript:window.opener."+str_target+
					"('"+dt2dtstr(dt_current_day)+"'); window.close();\">"+
					"<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
				str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
				dt_current_day.setDate(dt_current_day.getDate()+1);
		}
		// print row footer
		str_buffer += "</tr>\n";
	}
	// print calendar footer
	str_buffer +=
		"<tr><td colspan=\"7\" bgcolor=\"#87CEFA\">"+
		"</td></tr>\n" +
		"</table>\n" +
		"</tr>\n</td>\n</table>\n" +
		"</body>\n" +
		"</html>\n";

	var vWinCal = window.open("", "Calendar",
		"width=200,height=240,status=no,resizable=yes,top=200,left=200");
	vWinCal.opener = self;
	var calc_doc = vWinCal.document;
	calc_doc.write (str_buffer);
	calc_doc.close();
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_date)
 {
	var re_date = /^(\d+)\/(\d+)\/(\d+)$/;
	if (!re_date.exec(str_date))
		return alert("Invalid Datetime format: "+ str_date);
	return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
 }
function dt2dtstr (dt_datetime)
 {
 	return (new String (
			dt_datetime.getDate()+"/"+(dt_datetime.getMonth()+1)+"/"+dt_datetime.getFullYear()+""));
 }

function dt2usastr (dt_datetime)
 {
 	return (new String (
			(dt_datetime.getMonth()+1)+"/"+dt_datetime.getDate()+"/"+dt_datetime.getFullYear()+""));
 }
